/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: VariableRef.java,v 1.2.4.1 2005/09/05 09:33:50 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import com.sun.org.apache.bcel.internal.generic.CHECKCAST;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.GETFIELD;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeSetType;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 * @author Erwin Bolwidt <ejb@klomp.org>
 */
final class VariableRef extends VariableRefBase {

  public VariableRef(Variable variable) {
    super(variable);
  }

  public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    // Fall-through for variables that are implemented as methods
    if (_type.implementedAsMethod()) {
      return;
    }

    final String name = _variable.getEscapedName();
    final String signature = _type.toSignature();

    if (_variable.isLocal()) {
      if (classGen.isExternal()) {
        Closure variableClosure = _closure;
        while (variableClosure != null) {
          if (variableClosure.inInnerClass()) {
            break;
          }
          variableClosure = variableClosure.getParentClosure();
        }

        if (variableClosure != null) {
          il.append(ALOAD_0);
          il.append(new GETFIELD(
              cpg.addFieldref(variableClosure.getInnerClassName(),
                  name, signature)));
        } else {
          il.append(_variable.loadInstruction());
        }
      } else {
        il.append(_variable.loadInstruction());
      }
    } else {
      final String className = classGen.getClassName();
      il.append(classGen.loadTranslet());
      if (classGen.isExternal()) {
        il.append(new CHECKCAST(cpg.addClass(className)));
      }
      il.append(new GETFIELD(cpg.addFieldref(className, name, signature)));
    }

    if (_variable.getType() instanceof NodeSetType) {
      // The method cloneIterator() also does resetting
      final int clone = cpg.addInterfaceMethodref(NODE_ITERATOR,
          "cloneIterator",
          "()" +
              NODE_ITERATOR_SIG);
      il.append(new INVOKEINTERFACE(clone, 1));
    }
  }
}
